Looks good, and performs well.
You could arguably achieve that result using in-game textures. But since you're going for very specific aspects in each raider, you may keep the custom one if you prefer. I'd just recommend you to work a bit more on the chest tattoo, at the moment it looks blurry. Maybe adding some soft contours might help. (Not a required change)
All those raider variations could be very useful altogether. I'd recommend you had them all merged in a single bundle, even to have them better organized and accessible. (You may request it if you want)
Approved.